3Dball example error

when I load 3Dball example, this error occurs.

9448022--1325996--upload_2023-11-3_18-44-38.png
9448022--1325987--upload_2023-11-3_18-43-30.png
9448022--1325990--upload_2023-11-3_18-43-46.png
9448022--1325993--upload_2023-11-3_18-44-9.png

Maybe, this is related to this update:
9448022--1325984--upload_2023-11-3_18-42-15.png
then, what should i do...?

unity mlagents version: 3.0.0 (release21) -installed manually

downgrade to release 20

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